arch/ia64/kernel/traps.c

   1 /*
   2  * Architecture-specific trap handling.
   3  *
   4  * Copyright (C) 1998-2003 Hewlett-Packard Co
   5  *      David Mosberger-Tang <davidm@hpl.hp.com>
   6  *
   7  * 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
   8  */
   9
  10 #include <linux/config.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/sched.h>
  14 #include <linux/tty.h>
  15 #include <linux/vt_kern.h>              /* For unblank_screen() */
  16 #include <linux/module.h>       /* for EXPORT_SYMBOL */
  17 #include <linux/hardirq.h>
  18 #include <linux/kprobes.h>
  19 #include <linux/delay.h>                /* for ssleep() */
  20
  21 #include <asm/fpswa.h>
  22 #include <asm/ia32.h>
  23 #include <asm/intrinsics.h>
  24 #include <asm/processor.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/kdebug.h>
  27
  28 extern spinlock_t timerlist_lock;
  29
  30 fpswa_interface_t *fpswa_interface;
  31 EXPORT_SYMBOL(fpswa_interface);
  32
  33 struct notifier_block *ia64die_chain;
  34
  35 int
  36 register_die_notifier(struct notifier_block *nb)
  37 {
  38         return notifier_chain_register(&ia64die_chain, nb);
  39 }
  40 EXPORT_SYMBOL_GPL(register_die_notifier);
  41
  42 int
  43 unregister_die_notifier(struct notifier_block *nb)
  44 {
  45         return notifier_chain_unregister(&ia64die_chain, nb);
  46 }
  47 EXPORT_SYMBOL_GPL(unregister_die_notifier);
  48
  49 void __init
  50 trap_init (void)
  51 {
  52         if (ia64_boot_param->fpswa)
  53                 /* FPSWA fixup: make the interface pointer a kernel virtual address: */
  54                 fpswa_interface = __va(ia64_boot_param->fpswa);
  55 }
  56
  57 /*
  58  * Unlock any spinlocks which will prevent us from getting the message out (timerlist_lock
  59  * is acquired through the console unblank code)
  60  */
  61 void
  62 bust_spinlocks (int yes)
  63 {
  64         int loglevel_save = console_loglevel;
  65
  66         if (yes) {
  67                 oops_in_progress = 1;
  68                 return;
  69         }
  70
  71 #ifdef CONFIG_VT
  72         unblank_screen();
  73 #endif
  74         oops_in_progress = 0;
  75         /*
  76          * OK, the message is on the console.  Now we call printk() without
  77          * oops_in_progress set so that printk will give klogd a poke.  Hold onto
  78          * your hats...
  79          */
  80         console_loglevel = 15;          /* NMI oopser may have shut the console up */
  81         printk(" ");
  82         console_loglevel = loglevel_save;
  83 }
  84
  85 void
  86 die (const char *str, struct pt_regs *regs, long err)
  87 {
  88         static struct {
  89                 spinlock_t lock;
  90                 u32 lock_owner;
  91                 int lock_owner_depth;
  92         } die = {
  93                 .lock =                 SPIN_LOCK_UNLOCKED,
  94                 .lock_owner =           -1,
  95                 .lock_owner_depth =     0
  96         };
  97         static int die_counter;
  98         int cpu = get_cpu();
  99
 100         if (die.lock_owner != cpu) {
 101                 console_verbose();
 102                 spin_lock_irq(&die.lock);
 103                 die.lock_owner = cpu;
 104                 die.lock_owner_depth = 0;
 105                 bust_spinlocks(1);
 106         }
 107         put_cpu();
 108
 109         if (++die.lock_owner_depth < 3) {
 110                 printk("%s[%d]: %s %ld [%d]\n",
 111                         current->comm, current->pid, str, err, ++die_counter);
 112                 (void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
 113                 show_regs(regs);
 114         } else
 115                 printk(KERN_ERR "Recursive die() failure, output suppressed\n");
 116
 117         bust_spinlocks(0);
 118         die.lock_owner = -1;
 119         spin_unlock_irq(&die.lock);
 120
 121         if (panic_on_oops) {
 122                 printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
 123                 ssleep(5);
 124                 panic("Fatal exception");
 125         }
 126
 127         do_exit(SIGSEGV);
 128 }
 129
 130 void
 131 die_if_kernel (char *str, struct pt_regs *regs, long err)
 132 {
 133         if (!user_mode(regs))
 134                 die(str, regs, err);
 135 }
 136
 137 void
 138 __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
 139 {
 140         siginfo_t siginfo;
 141         int sig, code;
 142
 143         /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
 144         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 145         siginfo.si_imm = break_num;
 146         siginfo.si_flags = 0;           /* clear __ISR_VALID */
 147         siginfo.si_isr = 0;
 148
 149         switch (break_num) {
 150               case 0: /* unknown error (used by GCC for __builtin_abort()) */
 151                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
 152                                 == NOTIFY_STOP)
 153                         return;
 154                 die_if_kernel("bugcheck!", regs, break_num);
 155                 sig = SIGILL; code = ILL_ILLOPC;
 156                 break;
 157
 158               case 1: /* integer divide by zero */
 159                 sig = SIGFPE; code = FPE_INTDIV;
 160                 break;
 161
 162               case 2: /* integer overflow */
 163                 sig = SIGFPE; code = FPE_INTOVF;
 164                 break;
 165
 166               case 3: /* range check/bounds check */
 167                 sig = SIGFPE; code = FPE_FLTSUB;
 168                 break;
 169
 170               case 4: /* null pointer dereference */
 171                 sig = SIGSEGV; code = SEGV_MAPERR;
 172                 break;
 173
 174               case 5: /* misaligned data */
 175                 sig = SIGSEGV; code = BUS_ADRALN;
 176                 break;
 177
 178               case 6: /* decimal overflow */
 179                 sig = SIGFPE; code = __FPE_DECOVF;
 180                 break;
 181
 182               case 7: /* decimal divide by zero */
 183                 sig = SIGFPE; code = __FPE_DECDIV;
 184                 break;
 185
 186               case 8: /* packed decimal error */
 187                 sig = SIGFPE; code = __FPE_DECERR;
 188                 break;
 189
 190               case 9: /* invalid ASCII digit */
 191                 sig = SIGFPE; code = __FPE_INVASC;
 192                 break;
 193
 194               case 10: /* invalid decimal digit */
 195                 sig = SIGFPE; code = __FPE_INVDEC;
 196                 break;
 197
 198               case 11: /* paragraph stack overflow */
 199                 sig = SIGSEGV; code = __SEGV_PSTKOVF;
 200                 break;
 201
 202               case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
 203                 sig = SIGILL; code = __ILL_BNDMOD;
 204                 break;
 205
 206               default:
 207                 if (break_num < 0x40000 || break_num > 0x100000)
 208                         die_if_kernel("Bad break", regs, break_num);
 209
 210                 if (break_num < 0x80000) {
 211                         sig = SIGILL; code = __ILL_BREAK;
 212                 } else {
 213                         if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
 214                                         == NOTIFY_STOP)
 215                                 return;
 216                         sig = SIGTRAP; code = TRAP_BRKPT;
 217                 }
 218         }
 219         siginfo.si_signo = sig;
 220         siginfo.si_errno = 0;
 221         siginfo.si_code = code;
 222         force_sig_info(sig, &siginfo, current);
 223 }
 224
 225 /*
 226  * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
 227  * and it doesn't own the fp-high register partition.  When this happens, we save the
 228  * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
 229  * the fp-high partition of the current task (if necessary).  Note that the kernel has
 230  * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
 231  * care of clearing psr.dfh.
 232  */
 233 static inline void
 234 disabled_fph_fault (struct pt_regs *regs)
 235 {
 236         struct ia64_psr *psr = ia64_psr(regs);
 237
 238         /* first, grant user-level access to fph partition: */
 239         psr->dfh = 0;
 240
 241         /*
 242          * Make sure that no other task gets in on this processor
 243          * while we're claiming the FPU
 244          */
 245         preempt_disable();
 246 #ifndef CONFIG_SMP
 247         {
 248                 struct task_struct *fpu_owner
 249                         = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
 250
 251                 if (ia64_is_local_fpu_owner(current)) {
 252                         preempt_enable_no_resched();
 253                         return;
 254                 }
 255
 256                 if (fpu_owner)
 257                         ia64_flush_fph(fpu_owner);
 258         }
 259 #endif /* !CONFIG_SMP */
 260         ia64_set_local_fpu_owner(current);
 261         if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
 262                 __ia64_load_fpu(current->thread.fph);
 263                 psr->mfh = 0;
 264         } else {
 265                 __ia64_init_fpu();
 266                 /*
 267                  * Set mfh because the state in thread.fph does not match the state in
 268                  * the fph partition.
 269                  */
 270                 psr->mfh = 1;
 271         }
 272         preempt_enable_no_resched();
 273 }
 274
 275 static inline int
 276 fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
 277             struct pt_regs *regs)
 278 {
 279         fp_state_t fp_state;
 280         fpswa_ret_t ret;
 281
 282         if (!fpswa_interface)
 283                 return -1;
 284
 285         memset(&fp_state, 0, sizeof(fp_state_t));
 286
 287         /*
 288          * compute fp_state.  only FP registers f6 - f11 are used by the
 289          * kernel, so set those bits in the mask and set the low volatile
 290          * pointer to point to these registers.
 291          */
 292         fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
 293
 294         fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
 295         /*
 296          * unsigned long (*EFI_FPSWA) (
 297          *      unsigned long    trap_type,
 298          *      void             *Bundle,
 299          *      unsigned long    *pipsr,
 300          *      unsigned long    *pfsr,
 301          *      unsigned long    *pisr,
 302          *      unsigned long    *ppreds,
 303          *      unsigned long    *pifs,
 304          *      void             *fp_state);
 305          */
 306         ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
 307                                         (unsigned long *) ipsr, (unsigned long *) fpsr,
 308                                         (unsigned long *) isr, (unsigned long *) pr,
 309                                         (unsigned long *) ifs, &fp_state);
 310
 311         return ret.status;
 312 }
 313
 314 /*
 315  * Handle floating-point assist faults and traps.
 316  */
 317 static int
 318 handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
 319 {
 320         long exception, bundle[2];
 321         unsigned long fault_ip;
 322         struct siginfo siginfo;
 323         static int fpu_swa_count = 0;
 324         static unsigned long last_time;
 325
 326         fault_ip = regs->cr_iip;
 327         if (!fp_fault && (ia64_psr(regs)->ri == 0))
 328                 fault_ip -= 16;
 329         if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
 330                 return -1;
 331
 332         if (jiffies - last_time > 5*HZ)
 333                 fpu_swa_count = 0;
 334         if ((fpu_swa_count < 4) && !(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) {
 335                 last_time = jiffies;
 336                 ++fpu_swa_count;
 337                 printk(KERN_WARNING
 338                        "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
 339                        current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
 340         }
 341
 342         exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
 343                                &regs->cr_ifs, regs);
 344         if (fp_fault) {
 345                 if (exception == 0) {
 346                         /* emulation was successful */
 347                         ia64_increment_ip(regs);
 348                 } else if (exception == -1) {
 349                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 350                         return -1;
 351                 } else {
 352                         /* is next instruction a trap? */
 353                         if (exception & 2) {
 354                                 ia64_increment_ip(regs);
 355                         }
 356                         siginfo.si_signo = SIGFPE;
 357                         siginfo.si_errno = 0;
 358                         siginfo.si_code = __SI_FAULT;   /* default code */
 359                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 360                         if (isr & 0x11) {
 361                                 siginfo.si_code = FPE_FLTINV;
 362                         } else if (isr & 0x22) {
 363                                 /* denormal operand gets the same si_code as underflow
 364                                 * see arch/i386/kernel/traps.c:math_error()  */
 365                                 siginfo.si_code = FPE_FLTUND;
 366                         } else if (isr & 0x44) {
 367                                 siginfo.si_code = FPE_FLTDIV;
 368                         }
 369                         siginfo.si_isr = isr;
 370                         siginfo.si_flags = __ISR_VALID;
 371                         siginfo.si_imm = 0;
 372                         force_sig_info(SIGFPE, &siginfo, current);
 373                 }
 374         } else {
 375                 if (exception == -1) {
 376                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 377                         return -1;
 378                 } else if (exception != 0) {
 379                         /* raise exception */
 380                         siginfo.si_signo = SIGFPE;
 381                         siginfo.si_errno = 0;
 382                         siginfo.si_code = __SI_FAULT;   /* default code */
 383                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 384                         if (isr & 0x880) {
 385                                 siginfo.si_code = FPE_FLTOVF;
 386                         } else if (isr & 0x1100) {
 387                                 siginfo.si_code = FPE_FLTUND;
 388                         } else if (isr & 0x2200) {
 389                                 siginfo.si_code = FPE_FLTRES;
 390                         }
 391                         siginfo.si_isr = isr;
 392                         siginfo.si_flags = __ISR_VALID;
 393                         siginfo.si_imm = 0;
 394                         force_sig_info(SIGFPE, &siginfo, current);
 395                 }
 396         }
 397         return 0;
 398 }
 399
 400 struct illegal_op_return {
 401         unsigned long fkt, arg1, arg2, arg3;
 402 };
 403
 404 struct illegal_op_return
 405 ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
 406                        long arg4, long arg5, long arg6, long arg7,
 407                        struct pt_regs regs)
 408 {
 409         struct illegal_op_return rv;
 410         struct siginfo si;
 411         char buf[128];
 412
 413 #ifdef CONFIG_IA64_BRL_EMU
 414         {
 415                 extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
 416
 417                 rv = ia64_emulate_brl(&regs, ec);
 418                 if (rv.fkt != (unsigned long) -1)
 419                         return rv;
 420         }
 421 #endif
 422
 423         sprintf(buf, "IA-64 Illegal operation fault");
 424         die_if_kernel(buf, &regs, 0);
 425
 426         memset(&si, 0, sizeof(si));
 427         si.si_signo = SIGILL;
 428         si.si_code = ILL_ILLOPC;
 429         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
 430         force_sig_info(SIGILL, &si, current);
 431         rv.fkt = 0;
 432         return rv;
 433 }
 434
 435 void __kprobes
 436 ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
 437             unsigned long iim, unsigned long itir, long arg5, long arg6,
 438             long arg7, struct pt_regs regs)
 439 {
 440         unsigned long code, error = isr, iip;
 441         struct siginfo siginfo;
 442         char buf[128];
 443         int result, sig;
 444         static const char *reason[] = {
 445                 "IA-64 Illegal Operation fault",
 446                 "IA-64 Privileged Operation fault",
 447                 "IA-64 Privileged Register fault",
 448                 "IA-64 Reserved Register/Field fault",
 449                 "Disabled Instruction Set Transition fault",
 450                 "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
 451                 "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
 452                 "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
 453         };
 454
 455         if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
 456                 /*
 457                  * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
 458                  * the lfetch.
 459                  */
 460                 ia64_psr(&regs)->ed = 1;
 461                 return;
 462         }
 463
 464         iip = regs.cr_iip + ia64_psr(&regs)->ri;
 465
 466         switch (vector) {
 467               case 24: /* General Exception */
 468                 code = (isr >> 4) & 0xf;
 469                 sprintf(buf, "General Exception: %s%s", reason[code],
 470                         (code == 3) ? ((isr & (1UL << 37))
 471                                        ? " (RSE access)" : " (data access)") : "");
 472                 if (code == 8) {
 473 # ifdef CONFIG_IA64_PRINT_HAZARDS
 474                         printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
 475                                current->comm, current->pid,
 476                                regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
 477 # endif
 478                         return;
 479                 }
 480                 break;
 481
 482               case 25: /* Disabled FP-Register */
 483                 if (isr & 2) {
 484                         disabled_fph_fault(&regs);
 485                         return;
 486                 }
 487                 sprintf(buf, "Disabled FPL fault---not supposed to happen!");
 488                 break;
 489
 490               case 26: /* NaT Consumption */
 491                 if (user_mode(&regs)) {
 492                         void __user *addr;
 493
 494                         if (((isr >> 4) & 0xf) == 2) {
 495                                 /* NaT page consumption */
 496                                 sig = SIGSEGV;
 497                                 code = SEGV_ACCERR;
 498                                 addr = (void __user *) ifa;
 499                         } else {
 500                                 /* register NaT consumption */
 501                                 sig = SIGILL;
 502                                 code = ILL_ILLOPN;
 503                                 addr = (void __user *) (regs.cr_iip
 504                                                         + ia64_psr(&regs)->ri);
 505                         }
 506                         siginfo.si_signo = sig;
 507                         siginfo.si_code = code;
 508                         siginfo.si_errno = 0;
 509                         siginfo.si_addr = addr;
 510                         siginfo.si_imm = vector;
 511                         siginfo.si_flags = __ISR_VALID;
 512                         siginfo.si_isr = isr;
 513                         force_sig_info(sig, &siginfo, current);
 514                         return;
 515                 } else if (ia64_done_with_exception(&regs))
 516                         return;
 517                 sprintf(buf, "NaT consumption");
 518                 break;
 519
 520               case 31: /* Unsupported Data Reference */
 521                 if (user_mode(&regs)) {
 522                         siginfo.si_signo = SIGILL;
 523                         siginfo.si_code = ILL_ILLOPN;
 524                         siginfo.si_errno = 0;
 525                         siginfo.si_addr = (void __user *) iip;
 526                         siginfo.si_imm = vector;
 527                         siginfo.si_flags = __ISR_VALID;
 528                         siginfo.si_isr = isr;
 529                         force_sig_info(SIGILL, &siginfo, current);
 530                         return;
 531                 }
 532                 sprintf(buf, "Unsupported data reference");
 533                 break;
 534
 535               case 29: /* Debug */
 536               case 35: /* Taken Branch Trap */
 537               case 36: /* Single Step Trap */
 538                 if (fsys_mode(current, &regs)) {
 539                         extern char __kernel_syscall_via_break[];
 540                         /*
 541                          * Got a trap in fsys-mode: Taken Branch Trap
 542                          * and Single Step trap need special handling;
 543                          * Debug trap is ignored (we disable it here
 544                          * and re-enable it in the lower-privilege trap).
 545                          */
 546                         if (unlikely(vector == 29)) {
 547                                 set_thread_flag(TIF_DB_DISABLED);
 548                                 ia64_psr(&regs)->db = 0;
 549                                 ia64_psr(&regs)->lp = 1;
 550                                 return;
 551                         }
 552                         /* re-do the system call via break 0x100000: */
 553                         regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
 554                         ia64_psr(&regs)->ri = 0;
 555                         ia64_psr(&regs)->cpl = 3;
 556                         return;
 557                 }
 558                 switch (vector) {
 559                       case 29:
 560                         siginfo.si_code = TRAP_HWBKPT;
 561 #ifdef CONFIG_ITANIUM
 562                         /*
 563                          * Erratum 10 (IFA may contain incorrect address) now has
 564                          * "NoFix" status.  There are no plans for fixing this.
 565                          */
 566                         if (ia64_psr(&regs)->is == 0)
 567                           ifa = regs.cr_iip;
 568 #endif
 569                         break;
 570                       case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
 571                       case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
 572                 }
 573                 if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
 574                                 == NOTIFY_STOP)
 575                         return;
 576                 siginfo.si_signo = SIGTRAP;
 577                 siginfo.si_errno = 0;
 578                 siginfo.si_addr  = (void __user *) ifa;
 579                 siginfo.si_imm   = 0;
 580                 siginfo.si_flags = __ISR_VALID;
 581                 siginfo.si_isr   = isr;
 582                 force_sig_info(SIGTRAP, &siginfo, current);
 583                 return;
 584
 585               case 32: /* fp fault */
 586               case 33: /* fp trap */
 587                 result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
 588                 if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
 589                         siginfo.si_signo = SIGFPE;
 590                         siginfo.si_errno = 0;
 591                         siginfo.si_code = FPE_FLTINV;
 592                         siginfo.si_addr = (void __user *) iip;
 593                         siginfo.si_flags = __ISR_VALID;
 594                         siginfo.si_isr = isr;
 595                         siginfo.si_imm = 0;
 596                         force_sig_info(SIGFPE, &siginfo, current);
 597                 }
 598                 return;
 599
 600               case 34:
 601                 if (isr & 0x2) {
 602                         /* Lower-Privilege Transfer Trap */
 603
 604                         /* If we disabled debug traps during an fsyscall,
 605                          * re-enable them here.
 606                          */
 607                         if (test_thread_flag(TIF_DB_DISABLED)) {
 608                                 clear_thread_flag(TIF_DB_DISABLED);
 609                                 ia64_psr(&regs)->db = 1;
 610                         }
 611
 612                         /*
 613                          * Just clear PSR.lp and then return immediately:
 614                          * all the interesting work (e.g., signal delivery)
 615                          * is done in the kernel exit path.
 616                          */
 617                         ia64_psr(&regs)->lp = 0;
 618                         return;
 619                 } else {
 620                         /* Unimplemented Instr. Address Trap */
 621                         if (user_mode(&regs)) {
 622                                 siginfo.si_signo = SIGILL;
 623                                 siginfo.si_code = ILL_BADIADDR;
 624                                 siginfo.si_errno = 0;
 625                                 siginfo.si_flags = 0;
 626                                 siginfo.si_isr = 0;
 627                                 siginfo.si_imm = 0;
 628                                 siginfo.si_addr = (void __user *) iip;
 629                                 force_sig_info(SIGILL, &siginfo, current);
 630                                 return;
 631                         }
 632                         sprintf(buf, "Unimplemented Instruction Address fault");
 633                 }
 634                 break;
 635
 636               case 45:
 637 #ifdef CONFIG_IA32_SUPPORT
 638                 if (ia32_exception(&regs, isr) == 0)
 639                         return;
 640 #endif
 641                 printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
 642                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
 643                        iip, ifa, isr);
 644                 force_sig(SIGSEGV, current);
 645                 break;
 646
 647               case 46:
 648 #ifdef CONFIG_IA32_SUPPORT
 649                 if (ia32_intercept(&regs, isr) == 0)
 650                         return;
 651 #endif
 652                 printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
 653                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
 654                        iip, ifa, isr, iim);
 655                 force_sig(SIGSEGV, current);
 656                 return;
 657
 658               case 47:
 659                 sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
 660                 break;
 661
 662               default:
 663                 sprintf(buf, "Fault %lu", vector);
 664                 break;
 665         }
 666         die_if_kernel(buf, &regs, error);
 667         force_sig(SIGILL, current);
 668 }